A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility
In this study, we report a novel high-Mn Fe–21Mn–6Al–4Si–1C (wt.%) duplex lightweight steel with concurrent chemical ordering and twinning-induced plasticity effects. This steel is capable of achieving an exceptional combination of strength and ductility following either cold-rolling and annealing a...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424022038 |
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| author | Huihui Zhi Jinshan Li Lulu Li Yihua Luo Yanjing Su Minjie Lai |
| author_facet | Huihui Zhi Jinshan Li Lulu Li Yihua Luo Yanjing Su Minjie Lai |
| author_sort | Huihui Zhi |
| collection | DOAJ |
| description | In this study, we report a novel high-Mn Fe–21Mn–6Al–4Si–1C (wt.%) duplex lightweight steel with concurrent chemical ordering and twinning-induced plasticity effects. This steel is capable of achieving an exceptional combination of strength and ductility following either cold-rolling and annealing at 1000 °C or subsequent short-term aging at 550 °C. In its as-annealed state, this steel primarily consists of γ-austenite and α-ferrite, with α-ferrite appearing as dispersed particles within fully recrystallized γ grains. Furthermore, L′12- and D03-type ordered nanodomains exist within these two phases, respectively. The aging treatment negligibly affects the size and volume fraction of both the γ-austenite and α-ferrite, yet it enhances the degree of ordering as well as the size and volume fraction of their ordered nanodomains, leading to a rise in yield strength from ∼800 to ∼1062 MPa and a decline in total elongation from ∼60.4% to ∼44.4%. The high yield strength of this steel originates from multiple strengthening mechanisms involving dislocation interactions with solute atoms, ordered nanodomains, γ grain boundaries and γ/α phase boundaries. This steel plastically deforms via planar slip during the initial stages. The rather small γ grain size, coupled with the presence of hard α-ferrite particles, fosters the dynamic slip band refinement (DSBR) effect, thereby enhancing the flow stress sufficiently to trigger deformation twinning in the steel during the later stages. The DSBR effect, combined with the progressive formation of deformation twins, stacking faults and Lomer-Cottrell locks, imparts pronounced strain hardenability to this steel, leading to its outstanding ductility. |
| format | Article |
| id | doaj-art-882bdff5394542678f2ecbe28c03f9ad |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-882bdff5394542678f2ecbe28c03f9ad2025-08-20T01:57:21ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01332164218210.1016/j.jmrt.2024.09.198A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductilityHuihui Zhi0Jinshan Li1Lulu Li2Yihua Luo3Yanjing Su4Minjie Lai5State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China; Innovation Center NPU·Chongqing, 401135, Chongqing, China; Research & Development Institute of Northwestern Polytechnical University in Shenzhen, 518063, Shenzhen, China; Corresponding author. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China; Innovation Center NPU·Chongqing, 401135, Chongqing, China; Corresponding author. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China; Innovation Center NPU·Chongqing, 401135, Chongqing, China; Research & Development Institute of Northwestern Polytechnical University in Shenzhen, 518063, Shenzhen, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China; Innovation Center NPU·Chongqing, 401135, Chongqing, China; Research & Development Institute of Northwestern Polytechnical University in Shenzhen, 518063, Shenzhen, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, 100083, Beijing, China; Institute for Advanced Material and Technology, University of Science and Technology Beijing, 100083, Beijing, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China; Corresponding author. Corresponding author. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi'an, China.In this study, we report a novel high-Mn Fe–21Mn–6Al–4Si–1C (wt.%) duplex lightweight steel with concurrent chemical ordering and twinning-induced plasticity effects. This steel is capable of achieving an exceptional combination of strength and ductility following either cold-rolling and annealing at 1000 °C or subsequent short-term aging at 550 °C. In its as-annealed state, this steel primarily consists of γ-austenite and α-ferrite, with α-ferrite appearing as dispersed particles within fully recrystallized γ grains. Furthermore, L′12- and D03-type ordered nanodomains exist within these two phases, respectively. The aging treatment negligibly affects the size and volume fraction of both the γ-austenite and α-ferrite, yet it enhances the degree of ordering as well as the size and volume fraction of their ordered nanodomains, leading to a rise in yield strength from ∼800 to ∼1062 MPa and a decline in total elongation from ∼60.4% to ∼44.4%. The high yield strength of this steel originates from multiple strengthening mechanisms involving dislocation interactions with solute atoms, ordered nanodomains, γ grain boundaries and γ/α phase boundaries. This steel plastically deforms via planar slip during the initial stages. The rather small γ grain size, coupled with the presence of hard α-ferrite particles, fosters the dynamic slip band refinement (DSBR) effect, thereby enhancing the flow stress sufficiently to trigger deformation twinning in the steel during the later stages. The DSBR effect, combined with the progressive formation of deformation twins, stacking faults and Lomer-Cottrell locks, imparts pronounced strain hardenability to this steel, leading to its outstanding ductility.http://www.sciencedirect.com/science/article/pii/S2238785424022038High-Mn steelChemical orderingPlanar slipDeformation twinning |
| spellingShingle | Huihui Zhi Jinshan Li Lulu Li Yihua Luo Yanjing Su Minjie Lai A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility Journal of Materials Research and Technology High-Mn steel Chemical ordering Planar slip Deformation twinning |
| title | A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility |
| title_full | A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility |
| title_fullStr | A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility |
| title_full_unstemmed | A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility |
| title_short | A novel high-Mn duplex twinning-induced plasticity lightweight steel with high yield strength and large ductility |
| title_sort | novel high mn duplex twinning induced plasticity lightweight steel with high yield strength and large ductility |
| topic | High-Mn steel Chemical ordering Planar slip Deformation twinning |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424022038 |
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